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Antimicrobial Agents and Chemotherapy, October 2004, p. 4047-4049, Vol. 48, No. 10
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.10.4047-4049.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Relationship between Phenotypic and Genotypic Florfenicol Resistance in Escherichia coli

Randall S. Singer,1,2* Sheila K. Patterson,1 Anne E. Meier,1 Jessica K. Gibson,1 Hannah L. Lee,1 and Carol W. Maddox1,3

Department of Veterinary Pathobiology,1 Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois, Urbana, Illinois,3 Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota2

Received 1 December 2003/ Returned for modification 3 March 2004/ Accepted 31 May 2004

This study evaluated the relationship between florfenicol resistance and flo genotypes in 1,987 Escherichia coli isolates from cattle. The flo gene was detected in 164 isolates, all of which expressed resistance to florfenicol at MICs of ≥256 µg/ml. The florfenicol MICs for all isolates that lacked flo were ≤16 µg/ml.

* Corresponding author. Mailing address: Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, 300A VSB, 1971 Commonwealth Ave., St. Paul, MN 55108. Phone: (612) 625-6271. Fax: (612) 625-5203. E-mail: singe024{at}umn.edu.

Antimicrobial Agents and Chemotherapy, October 2004, p. 4047-4049, Vol. 48, No. 10
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.10.4047-4049.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Rayamajhi, N., Cha, S. B., Kang, M. L., Lee, S. I., Lee, H. S., Yoo, H. S. (2009). Inter- and Intraspecies Plasmid-Mediated Transfer of Florfenicol Resistance in Enterobacteriaceae Isolates from Swine. Appl. Environ. Microbiol. 75: 5700-5703 [Abstract] [Full Text]  
  • Singer, R. S., Patterson, S. K., Wallace, R. L. (2008). Effects of Therapeutic Ceftiofur Administration to Dairy Cattle on Escherichia coli Dynamics in the Intestinal Tract. Appl. Environ. Microbiol. 74: 6956-6962 [Abstract] [Full Text]  
  • Sawant, A. A., Hegde, N. V., Straley, B. A., Donaldson, S. C., Love, B. C., Knabel, S. J., Jayarao, B. M. (2007). Antimicrobial-Resistant Enteric Bacteria from Dairy Cattle. Appl. Environ. Microbiol. 73: 156-163 [Abstract] [Full Text]  
  • Poole, K. (2005). Efflux-mediated antimicrobial resistance. J Antimicrob Chemother 56: 20-51 [Abstract] [Full Text]  


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